I see what you mean about the U-bolt not having threads that go down far enough. Of course you always have the option of using a stack of washers under the nuts. I had to do this once and I glued the washers together so I wasn't always fumbling with them.

At first I thought it was a Moxon and wondered what the Omni part was since a Moxon has a big front-back ratio. I never gave much thought to the difficulty of doing a horizontally polarized omni, but it can't be done with something as simple as a ground plane vertical or J-pole like you can use for a vertically polarized omni. This is clever, and small. Then I thought "I wonder how hard it would be to convert it to a Moxon.", but I looked it up but the square pipe would need to be about twice as long.

BTW, in the background I think I see several masts ranging from about 3M to 6M tall on houses. Are there a lot of radio operators there or are they for TV or something else?

I contacted Dale Parfitt about your antenna after watching your video and to get pricing and some info. He got right back to me with this:

These antennas are an entirely different design from the classical shortened half wave loops. Omniangles use an electrical length LONGER than a half wave and an isosceles triangle shape to synthesize a perfect omnidirectional pattern (within +/- 0.5dB). The square and round loops have an elliptical pattern with front to side ratios of 5dB and more! We hope to soon have plots taken at the Florida Motorola anechoic chamber of all of the commercial "omnis" on our site Our largest clients are commercial and military. As a result, all of our hardware is stainless, all metal surfaces are either polished or jitterbugged. The connectors are silver/teflon. The Omniangles are the only commercial series that have a built in balun and do not require an insulated mast in order to prevent mast/feedline radiation.

I think I will be buying one of these as soon as I can afford it. I just bought a HF Mag Loop, so I have to recover from first.